Schlage CE-401-221 is an MT20-only reader configuration card used to configure a 5ms USB inter-keystroke delay. This part under reader output settings within its general reader configuration cards.

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Manufacturer: Schlage
Part Number: CE-401-221
Product Type: Reader Configuration Card
Product Name: MT20 5ms Delay Configuration Card
Keystroke Latency: 5ms
Primary Function: Sets USB inter-keystroke delay to 5ms
Application: MT20 USB inter-keystroke delay configuration
Compatibility: MT20 Only
OEM Part: Yes